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Istituto sull'inquinamento atmosferico

Torna all'elenco Contributi in rivista anno 2010

Contributo in rivista

Tipo: Articolo in rivista

Titolo: A two-step optimization procedure for assessing water constituent concentrations by hyperspectral remote sensing techniques: an application to the highly turbid Venice lagoon waters.

Anno di pubblicazione: 2010

Formato: Elettronico

Autori: Santini, F. (a); Alberotanza, L. (b); Cavalli, R.M. (a); Pignatti, S. (c)

Affiliazioni autori: a) National Research Council, Institute for Atmospheric Pollution, via Fosso del Cavaliere 100, 00133 Rome, Italy; b) National Research Council, Marine science institute, Italy; c) National Research Council, Institute of Methodologies for Environmental Analysis, Italy;

Autori CNR:


Lingua: inglese

Abstract: ver the past few years, the increased spectral and spatial resolution of remote sensing equipment has promoted the investigation of new techniques for inland and coastal water monitoring. The availability of new high-resolution data has allowed improvements in models based on the radiative transfer theory for assessing optical water quality parameters. In this study, we fine-tuned a physical model for the highly turbid Venice lagoon waters and developed an inversion technique based on a two-step optimization procedure appropriate for hyperspectral data processing to retrieve water constituent concentrations from remote data. In the first step, the solution of a linearized analytical formulation of the radiative transfer equations was found. In the second step, this solution was used to provide the initial values in a non-linear least squares-based method. This effort represents a first step in the construction of a feasible and timely methodology for Venice lagoon water quality monitoring by remote sensing, especially in view of the existing experimental hyperspectral satellite (Hyperion) and the future missions such as PRISMA, EnMap and HyspIRI. The optical properties of the water constituents were assessed on the basis of sea/lagoon campaigns and data from the literature. The water light field was shaped by an analytical formulation of radiative transfer equations and the application of numerical simulations (Hydrolight software). Once the optical properties of the Venice lagoon bio-optical model were validated, the inverse procedure was applied to local radiometric spectra to retrieve concentrations of chlorophyll, colored dissolved organic matter and tripton. The inverse procedure was validated by comparing these concentrations with those measured in the laboratory from in situ water samples, then it was applied to airborne (CAST and MMS) and satellite (Hyperion) sensors to derive water constituent concentration maps. The consistent results encourage the use of this procedure using future missions satellite (PRISMA, EnMap and HyspIRl).

Lingua abstract: inglese

Pagine da: 887

Pagine a: 898

Pagine totali: 12


Remote sensing of environment American Elsevier Pub. Co.,
Paese di pubblicazione: Stati Uniti d'America
Lingua: inglese
ISSN: 0034-4257

Numero volume: 114

Numero fascicolo: 4

DOI: 10.1016/j.rse.2009.12.001

Referee: Sė: Internazionale

Indicizzato da: ISI Web of Science (WOS) [000274982700017]

Parole chiave:

  • Physical model
  • Water constituents
  • Optically deep water
  • Water quality
  • Hyperspectral Remote sensing

URL: http://www.elsevier.com/locate/rse

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